MySQL one-to-many join with Group By only returns one observation

Question

I have a comment table and a tag table. For each comment, there could be multiple tags, or none. I want to join the two so I can get a list of tags for each comment.

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Answer 1

try this:

SELECT c.CommentID, c.Title,  t.TagID  FROM Comment as c
        LEFT OUTER JOIN Tag as t ON c.CommentID = t.CommentID

edit1: If you want to return only one row per group as per the comment

SELECT c.CommentID, c.Title,MAX(t.TagID )
FROM Comment as c
left OUTER JOIN TagTable as t ON c.CommentID = t.CommentID
GROUP BY  c.CommentID, c.Title